Kim Jong-un's sister said her country is ready to take "quick, overwhelming action" against the United States and South Korea, a day after the US flew a nuclear-capable B-52 bomber in the region.
The US-South Korean training on Monday involving the B-52 bomber over the Korean Peninsula was the latest in a series of drills between the allies in recent months.
Their militaries are also preparing to revive their largest field exercises later this month.
